A handy page to gather everything Unreal related.
Recommended resources from Sanjay Kalyan.
'These videos address common issues is the rendering side of Unreal. Setting up Sky Atmosphere is also quite handy to have to help breakdown setting up our lighting environment"
Troubleshooting "Bad First Frame" during rendering by William Faucher
Setting up Sky Atmosphere by William Faucher
'This is a step by step set-up guide utilizing the UE documentation as a source; but the fundamentals of asset prep (Lightmass UV resolution and troubleshooting) for CPU lightmass are applicable with GPU lightmass (apart from the GPU lightmass specific bake settings). Specifically at 7:02 he cover's Lightmap UV's'
Bake Lighting FASTER with GPU Lightmass - Unreal Engine 4.26 by William Faucher
'Unreal Engine's YouTube channel is also a treasure trove of Lightmass tutorials
This one is quite good for troubleshooting Lightmap Bleeding'
How to Fix Lightmap Bleeding: Part One | Tips & Tricks | Unreal Engine
How to Fix Lightmap Bleeding: Part Two | Tips & Tricks | Unreal Engine
UE4 Reflection Captures - How-to Use by Ryan Manning